Switch to gnu11 as the default C standard.
Switch to gnu11 as the default C standard.

winksaville/common-tool,winksaville/common-tool,hendersa/px4-common-tool,hendersa/px4-common-tool,winksaville/common-tool,seL4/common-tool,hendersa/px4-common-tool,seL4/common-tool,seL4/common-tool